Reversing-switch for electric motors with oppositely-rotating magnets and armatures.



V. HARHORNL REVERSING SWITCH FOR ELECTRIC MOTORS WITH OPPOSITE-LYROTATING MAGNETS AND ARMATURES.

APPLICATION FILED EAR. 11, 1911. 1,01 1,778. Patented Dec. 12,1911.

l a W 13 mafia, [7003712271 Uzi/07726319 VICTOR EAR-HORN, OI FBIEDENAU,GERMANY.

WING-SWITCH FOB ELEC'I'B IC MOTORS OPPOSITELY-BOTATING MAGNETS ANDMATURES.

Specification of Letters Patent. Application filed March 11, 1911.Serial No. 613,855.

Patented Dec. 12, 1911.

To all whom it may concern:

Be it known that I, Vrc'ron HARHORN, a subject of the Emperor ofGermany, residing at Friedenau, in Germany, have in vented a certain newand useful Improvement in Reversing-Switches for Electric Motors withoppositely-Rotating Magnets and Armatures, of which the following is aspecification.

This invention relates to electric motors with oppositely rotatinmagnets and armatures, and more artic arl to electric motors. for automoile vehic es, of the class wherein a motor is built up inside aroadwheel, the field-magnet forming the hub, or part of the hub, andarmature being'rotated in theopposite direction to the hub, by means ofsuitable gearing. With motors of this class, having brushes rotatingwith the magnet, it is necessary to use slip-rings for the inflow andoutflow of current, and the object of this invention is to provideconvenient means for reversing the current in the armature without usingmore than two sliprm he invention is illustrated in the accompanyingdrawing, which is a transverse section of the hub, with some of theinternal parts shown in elevation, and with the electric circuitdiagrammatically indicated.

In the drawing, 1 is the armature, and-2 the commutator, A being thebox-like hub, with inwardly directed field-magnets 11 and 12..

3 and 4 are the two slip-rings rotating with the hub. Adjacent to theslip-ring 3 there are two insulated metal contact disks 7 and 8, bothfixed to the hub and thereby to the rotatable magnet. Betweentheslip-ring 3 and the contacts 7 and 8 there are two double contactsprin 5 and 6 mounted on a slidable and rotatab e sleeve 17,- which canbe axially moved b means of a lever 14, the

connection of the atter to the sleeve being suchas to allow the sleevetorotate without rotation of the lever. In the position in which thesleeve is shown in the drawing, the springs 5 and 6 make contact withthe slip-rm 3 and contact disk 7 respectively. By shi ing the sleeve 17to the right the s ring 5 can be brought into contact with edisk 7, andthe spring 6 into contact with the disk 8. The springs 5 and 6 areconductively connected by wires a and b to brushes 9 and 10respectively, the disk 7 is connected by wire a to the magnet-coils, andthe slip-ring 3 is'connected by wire 15 to the disk 8. j

With the springs 5 and 6 placed as shown 1n the drawing, the currentflows from the accumulator battery 13 to the slip-ring 3, thence throughthe spring 5 and wire a to the brush 9, and from the other brush 10 andwire I) to the spring 6 and disk 7 from the latter through wire 0 to thefield-magnets 11 and 12, and finally to the other slip-ring 4 and thenceback to the battery 13. If the lever 14 is moved to make connectionbetween spring 5 and disk 7, and spring 6 and disk 8, the currentsupplied from the battery 13 to the slip ring 3 passes through wire 15to the disk 8 and thence through spring 6 and wire I) to brush 10, then.

through .the commutator 2 and armature 1 to the brush 9, and throughwire a, spring 5, disk 7, wire 0, magnets 11 and 12, and slipring 4 backto the battery. It will be seen.

that the current in the armature is reversed by shifting the sleeve 17-.

What I claim as my invention and desire tso secure by Letters Patent ofthe United tates:

1. The combination of a rotatable field magnet, a rotatable motorarmature, two armature brushes, two slip-rings, a contact fixed to themagnet and electrically connected to one of the slip rings, a secondcontact fixed to the magnet and electrically connected to the otherslip-ring, and two collectively movable contacts severally connected tosaid brushes, enabling one brush to be alternatively connected to thefirst or the .second fixed contact and the other brush to bealternatively connected to the second fixed contact or to the slip-ringwhich is connected to the first fixed cont-ac 2. The combination of a:frotatable field magnet, a rotatable motor armature, a commutator, twobrushes contacting with said commutator, a slip-ring, acontactelectrically connected to the coils of said field magnet, acontact electrically connected to said slip-ring, and two collectivelymovable contacts severally connected to said brushes, enablin one brushto be alternatively connecte to the slip-ring or to the contactconnected to the magnet coils, and the other brush to be alternativelyconnected to the last-mentioned contact or to the contact joined to theslip-ring.

3. The combination with a road-wheel hub of a field magnt with inwardlydirected poles fixed to said hub, an armature rotatable within said hub,a I commutator, two brushes contacting with said commutator, aslip-ring, a contact electrically connected to the coils of said fieldmagnet, a contact electrically connected to said slip-ring, and twocollectively movable contacts severally connected to said brushes,enabling one brush to be alternatively connected to the slip-ring or tothe contact connected to the magnet coils, and the other brush to bealternatively connected to the last-mentioned contact or a nesses.

VICTOR HARHORN. Witnesses HENRY HASPER, VVdLommR HAUPT.

